Sapphire HD 7970 Vapor-X 3GB, change bios to 6GB

Hi, what happens is that I like to play with this and I would like to know if you could help me pass this Vbios with only 3 GB:

I could pass it to read 6gb.

The memories I soldered are the H5GC4H24AJR-T2C (14 modules * 512mb), they run at the same speed as those found in the original bios. These are the Hynix H5GQ2H24AFR.

However, it has the Bios with 6gb (24 modules * 256mb): VGA Bios Collection: Sapphire HD 7970 6 GB | TechPowerUp

I am immensely grateful.

Or, without any hassle, could you tell me which software or a guide on how to do the process?

thank you very much